writeLockFile example

$ioService->writeln('');
            $ioService->ask('Press return to start the update.');
            $ioService->cls();
        }

        $this->unpackFiles();
        $this->updateHtaccess();
        $this->migrateDatabase();
        $this->importSnippets();
        $this->cleanup();
        $this->synchronizeThemes();
        $this->writeLockFile();

        $ioService->cls();
        $ioService->writeln('');
        $ioService->writeln('');
        $ioService->writeln('<info>The update has been finished succesfuly.</info>');
        $ioService->writeln('Your shop is currently in maintenance mode.');
        $ioService->writeln(sprintf('Please delete <question>%s</question> to finish the update.', UPDATE_ASSET_PATH));
        $ioService->writeln('');

        return 0;
    }